TW202340781A - Optical imaging lens - Google Patents

Abstract

An optical imaging lens, in order from an object side to an image side along an optical axis, includes a first lens assembly, an aperture, and a second lens assembly. The first lens assembly includes a first lens having negative refractive power and a second lens having positive refractive power. The second lens assembly includes a third lens having positive refractive power, a fourth lens having negative refractive power, and a fifth lens having positive refractive power. The optical imaging lens satisfies: -5 < fg1/F < -3.5 and 1.5 < fg2/F < 2.5; F is a focal length of the optical imaging lens; fg1 is a focal length of the first lens assembly; fg2 is a focal length of the second lens assembly, thereby achieving the effect of high image quality.

Description

Optical imaging lens

The invention relates to the application field of optical imaging systems; in particular, it refers to an optical imaging lens with low distortion and good imaging quality.

In recent years, with the rise of portable electronic products with photography functions, the demand for optical systems has been increasing. The photosensitive elements of general optical systems are nothing more than photosensitive coupling elements (Charge Coupled Device, CCD) or complementary metal-oxide semiconductor elements (Complementary Metal-Oxide Semiconductor Sensor, CMOS Sensor). With the advancement of semiconductor process technology, The pixel size of the photosensitive element has been reduced, and the optical system has gradually developed into the field of high pixels. In addition, with the booming development of drones and driverless autonomous vehicles, Advanced Driver Assistance System (ADAS) plays an important role, collecting environmental information through various lenses and sensors to protect drivers. Driving safety. In addition, as the temperature of the external application environment of automotive lenses changes, the temperature requirements for lens quality also increase. Therefore, the requirements for imaging quality are also increasing.

Good imaging lenses generally have the advantages of low distortion, high resolution, etc. Moreover, in practical applications, issues of small size and cost must be considered. Therefore, designing a lens with good imaging quality under various restrictive conditions is a major problem for designers.

In view of this, the object of the present invention is to provide an optical imaging lens with the advantage of good imaging quality.

In order to achieve the above object, the optical imaging lens provided by the present invention sequentially includes a first lens group, an aperture and a second lens group along an optical axis from an object side to an image side. The first lens group includes a first lens and a second lens arranged along the optical axis from the object side to the image side; wherein the first lens has negative refractive power, and the object side of the first lens is convex. , the image side of the first lens is concave, and at least one of the object side and the image side of the first lens is aspherical; the second lens is a biconvex lens with positive refractive power, and the second lens At least one of the object side and the image side is an aspheric surface; the second lens group includes a third lens, a fourth lens and a fifth lens arranged along the optical axis from the object side to the image side; wherein The third lens is a biconvex lens with positive refractive power, and at least one of the object side and image side of the third lens is an aspheric surface; the fourth lens is a biconcave lens with negative refractive power, and the third lens At least one of the object-side surface and the image-side surface of the fourth lens is aspherical; the fifth lens is a biconvex lens with positive refractive power, and at least one of the object-side surface and the image-side surface of the fifth lens is aspherical; wherein , the optical imaging lens meets the following conditions: -5<fg1/F<-3.5, where F is the focal length of the optical imaging lens, and fg1 is the combined focal length of the first lens group.

Another embodiment of the present invention provides an optical imaging lens that sequentially includes a first lens group, an aperture, and a second lens group along an optical axis from an object side to an image side. The first lens group includes a first lens and a second lens arranged along the optical axis from the object side to the image side; wherein the first lens has negative refractive power, and the object side of the first lens is convex. , the image side of the first lens is concave, and at least one of the object side and the image side of the first lens is aspherical; the second lens is a biconvex lens with positive refractive power, and the second lens At least one of the object side and the image side is an aspheric surface; the second lens group includes a third lens, a fourth lens and a fifth lens arranged along the optical axis from the object side to the image side; wherein The third lens is a biconvex lens with positive refractive power, and at least one of the object side and image side of the third lens is an aspheric surface; the fourth lens is a biconcave lens with negative refractive power, and the third lens At least one of the object-side surface and the image-side surface of the fourth lens is aspherical; the fifth lens is a biconvex lens with positive refractive power, and at least one of the object-side surface and the image-side surface of the fifth lens is aspherical; wherein , the optical imaging lens meets the following conditions: 1.5<fg2/F<2.5, where F is the focal length of the optical imaging lens, and fg2 is the combined focal length of the second lens group.

The effect of the present invention is that the use of five lenses in the optical imaging lens can greatly improve the chromatic aberration of the lens and control the generation of aberrations, and the refractive power arrangement and condition characteristics of the optical imaging lens can achieve good imaging quality.

In order to illustrate the present invention more clearly, the preferred embodiments are described in detail below along with the drawings. Please refer to FIG. 1A , which is an optical imaging lens 100 according to a first embodiment of the present invention. It includes a first lens group G1 , an aperture ST and a second lens group G1 along an optical axis Z from an object side to an image side. Mirror group G2. In the first embodiment, the first lens group G1 includes a first lens L1 and a second lens L2 arranged along the optical axis Z from the object side to the image side; the second lens group G2 includes A third lens L3, a fourth lens L4 and a fifth lens L5 are arranged along the optical axis Z from the object side to the image side.

The first lens L1 is a convex-concave lens with negative refractive power, wherein the object side S1 of the first lens L1 is a convex surface protruding toward the object side arc, and the image side S2 of the first lens L1 is a concave surface, and At least one of the object side S1 and the image side S2 of the first lens L1 is an aspherical surface; in the first embodiment, a portion of the first lens L1 toward the image side is arc-shaped and concave to the image side S2, The optical axis Z passes through the object side S1 and the image side S2, and both the object side S1 and the image side S2 of the first lens L1 are aspherical surfaces.

The second lens L2 is a biconvex lens with positive refractive power, that is, both the object side S3 and the image side S4 of the second lens L2 are convex, and at least one of the object side S3 and the image side S4 of the second lens L2 is convex. is an aspheric surface. In the first embodiment, one side of the second lens L2 toward the image side is curved and protrudes into the object side S3, and the optical axis Z passes through the object side S3 and the image side S4, and The object side S3 and the image side S4 of the second lens L2 are both aspherical surfaces.

The third lens L3 is a biconvex lens with positive refractive power, that is, the object side S5 and the image side S6 of the third lens L3 are both convex, and at least one of the object side S5 and the image side S6 of the third lens L3 is convex. is an aspherical surface. In the first embodiment, one side of the third lens L3 toward the object side protrudes in an arc shape to form the object side S5, and the optical axis Z passes through the object side S5 and the image side S6, and The object side S5 and the image side S6 of the third lens L3 are both aspherical surfaces.

The fourth lens L4 is a biconcave lens with negative refractive power, that is, both the object side S7 and the image side S8 of the fourth lens L4 are concave, and at least one of the object side S7 and the image side S8 of the fourth lens L4 is concave. is an aspherical surface. In the first embodiment, one surface of the fourth lens L4 toward the object side is partially concave in an arc to form the object side S7, and the optical axis Z passes through the object side S7 and the image side S8, and Both the object side S7 and the image side S8 of the fourth lens L4 are aspherical surfaces.

The fifth lens L5 is a biconvex lens with positive refractive power, that is, both the object side S9 and the image side S10 of the fifth lens L5 are convex, and at least one of the object side S9 and the image side S10 of the fifth lens L5 is convex. is an aspherical surface. In the first embodiment, one side of the fifth lens L5 toward the object side protrudes in an arc shape to form the object side S9, and the optical axis Z passes through the object side S9 and the image side S10, and The object side S9 and the image side S10 of the fifth lens L5 are both aspherical surfaces.

In addition, the optical imaging lens 100 further includes an infrared filter L6. The infrared filter L6 is located on one side of the image side S10 of the fifth lens L5 and is used to filter out excess infrared rays in the image light passing through the first lens group G1 to the second lens group G2.

In order for the optical imaging lens 100 of the present invention to maintain good optical performance and high imaging quality, the optical imaging lens 100 also meets the following conditions: (1) -5＜fg1/F＜-3.5; (2) -2＜f1/F＜-1, 3.5＜f2/F＜5.5; (3) 1.5＜fg2/F＜2.5; (4) 1＜f3/F＜1.8, -1.5＜f4/F＜-0.5, 1＜f5/F＜2; (5) -3＜fg1/fg2＜-1.5.

Wherein, F is the focal length of the optical imaging lens 100, f1 is the focal length of the first lens L1; f2 is the focal length of the second lens L2; f3 is the focal length of the third lens L3; f4 is the focal length of the fourth lens L4. Focal length; f5 is the focal length of the fifth lens L5; fg1 is the combined focal length of the first lens group G1; fg2 is the combined focal length of the second lens group G2.

Table 1 below shows the data of the optical imaging lens 100 according to the first embodiment of the present invention, including: the focal length F (or effective focal length) of the optical imaging lens 100, the aperture value Fno, the field of view FOV, and the curvature radius R of each lens. , the distance between each surface and the next surface on the optical axis Z, the refractive index Nd of each lens, dispersion, and the focal length of each lens; among them, the unit of focal length, radius of curvature, and distance is mm. The data listed below are not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make appropriate changes to the parameters or settings after referring to the present invention, but they should still fall within the scope of the present invention. . Table I Focal length F= 2.773mm; Aperture value Fno=1.9; Field of view FOV=92 degrees Surface number Radius of curvature R distance Refractive indexNd dispersion focal length Remarks S1 3.08 1.26 1.53 56.28 -4.11 First lens L1 S2 1.09 3.03 S3 20.39 1.63 1.64 23.97 11.22 Second lens L2 S4 -10.74 1.49 ST Infinity 0.39 Aperture ST S5 4.47 2.21 1.53 56.28 3.39 Third lens L3 S6 -2.46 0.15 S7 -5.73 0.90 1.64 23.97 -2.44 Fourth lens L4 S8 2.28 0.32 S9 2.76 3.38 1.53 56.28 3.61 Fifth lens L5 S10 -3.54 0.53 S11 Infinity 0.3 1.52 64.17 Infrared filter L6 Im Infinity 2.23 Imaging surface Im

From the above Table 1, it can be seen that the focal length of the optical imaging lens 100 of the first embodiment is F=2.773mm, the aperture value Fno=1.9, the field of view FOV=92 degrees, and the focal length of the first lens L1 is f1=-4.11mm. , the focal length of the second lens L2 is f2=11.22mm, the focal length of the third lens L3 is f3=3.39mm, the focal length of the fourth lens L4 is f4=-2.44mm, the focal length of the fifth lens L5 is f5=3.61mm, The combined focal length of the first lens group G1 is fg1=-11.543, and the combined focal length of the second lens group G2 is fg2=5.08mm.

In addition, based on the above detailed parameters, the detailed numerical values of the aforementioned conditional expression in the first embodiment are as follows: (1) fg1/F=-4.16; (2) f1/F=-1.48, f2/F=4.05; (3) fg2/F=1.83; (4) f3/F=1.22, f4/F=-0.88, f5/F=1.3; (5) fg1/fg2=-2.27.

From the data in Table 1, it can be concluded that the first lens group G1 and the second lens group G2 satisfy the aforementioned conditions (1) to (5) set for the optical imaging lens 100 .

In addition, in the optical imaging lens 100 of the first embodiment, the aspheric surfaces of the object side S1, S3, S5, S7, S9 and the image side S2, S4, S6, S8, S10 of the first lens L1 to the fifth lens L5 The surface profile shape Z is obtained by the following formula: Among them, Z: the contour shape of the aspheric surface; c: the reciprocal of the radius of curvature; h: the off-axis half height of the surface; k: cone coefficient; A4, A6, A8, A10, A12, A14 and A16: the off-axis half height of the surface Coefficients of various orders of high h.

The cone coefficients of the object side surfaces S1, S3, S5, S7, S9 and the image side surfaces S2, S4, S6, S8, S10 of the first lens L1 to the fifth lens L5 in the optical imaging lens 100 according to the first embodiment of the present invention k and the coefficients of each order of A4, A6, A8, A10, A12, A14 and A16, as shown in Tables 2 and 3 below: Table 2 Surface number S1 S2 S3 S4 S5 k -9.5654E-01 1.0910E+00 -8.5356E+01 5.8401E+00 5.8401E+00 A4 -1.1363E-02 -9.6941E-01 -4.6763E-03 -6.3614E-03 -6.3614E-03 A6 6.0952E-04 -9.3341E-03 -1.3360E-03 -6.8122E-04 -6.8122E-04 A8 -2.1269E-05 1.8485E-03 6.9672E-05 5.5874E-05 5.5874E-05 A10 4.4885E-07 -7.0966E-04 -5.0964E-05 1.0655E-05 1.0655E-05 A12 -3.7516E-09 1.2399E-04 6.5704E-06 -1.1859E-06 -1.1859E-06 A14 0 -9.0997E-06 0 0 0 A16 0 0 0 0 0 Table 3 Surface number S6 S7 S8 S9 S10 k -9.8164E+00 -7.8110E+00 -1.1433E+01 -1.1969E+01 -1.7673E-01 A4 -2.5103E-02 -1.0317E-02 -2.0479E-04 -9.2539E-04 4.3153E-04 A6 1.1097E-04 -1.2818E-02 -7.1053E-04 7.7713E-04 4.7055E-04 A8 -3.2003E-04 3.9306E-03 3.5586E-04 -7.0750E-05 -4.7252E-05 A10 1.3035E-04 -8.8094E-04 -6.1008E-05 2.8765E-06 4.9825E-06 A12 -3.1514E-05 9.5055E-05 3.8208E-06 -2.4795E-17 -2.5536E-17 A14 0 0 0 0 0 A16 0 0 0 0 0

Next, optical simulation data is used to verify the imaging quality of the optical imaging lens 100 . 1B is a graph of longitudinal spherical aberration, astigmatism and optical distortion according to the first embodiment of the present invention. It can be verified from the results of FIG. 1B that the optical imaging lens 100 of this embodiment can effectively improve imaging quality through the above design.

Please refer to FIG. 2A , which is an optical imaging lens 200 according to a second embodiment of the present invention. It includes a first lens group G1 , an aperture ST and a second lens group G1 along an optical axis Z from an object side to an image side. Mirror group G2. In the second embodiment, the first lens group G1 includes a first lens L1 and a second lens L2 arranged along the optical axis Z from the object side to the image side; the second lens group G2 includes A third lens L3, a fourth lens L4 and a fifth lens L5 are arranged along the optical axis Z from the object side to the image side.

The first lens L1 is a convex-concave lens with negative refractive power, wherein the object side S1 of the first lens L1 is a convex surface protruding toward the object side arc, and the image side S2 of the first lens L1 is a concave surface, and At least one of the object side S1 and the image side S2 of the first lens L1 is an aspherical surface; in the second embodiment, a portion of the first lens L1 toward the image side is arc-shaped and concave to the image side S2, The optical axis Z passes through the object side S1 and the image side S2, and both the object side S1 and the image side S2 of the first lens L1 are aspherical surfaces.

The second lens L2 is a biconvex lens with positive refractive power, that is, both the object side S3 and the image side S4 of the second lens L2 are convex, and at least one of the object side S3 and the image side S4 of the second lens L2 is convex. is an aspherical surface. In the second embodiment, one side of the second lens L2 toward the image side is curved and protrudes into the object side S3, and the optical axis Z passes through the object side S3 and the image side S4, and The object side S3 and the image side S4 of the second lens L2 are both aspherical surfaces.

The third lens L3 is a biconvex lens with positive refractive power, that is, the object side S5 and the image side S6 of the third lens L3 are both convex, and at least one of the object side S5 and the image side S6 of the third lens L3 is convex. is an aspherical surface. In the second embodiment, one side of the third lens L3 toward the object side protrudes in an arc shape to form the object side S5, and the optical axis Z passes through the object side S5 and the image side S6, and The object side S5 and the image side S6 of the third lens L3 are both aspherical surfaces.

The fourth lens L4 is a biconcave lens with negative refractive power, that is, both the object side S7 and the image side S8 of the fourth lens L4 are concave, and at least one of the object side S7 and the image side S8 of the fourth lens L4 is concave. is an aspherical surface. In the second embodiment, one surface of the fourth lens L4 toward the object side is partially concave in an arc to form the object side S7, and the optical axis Z passes through the object side S7 and the image side S8, and Both the object side S7 and the image side S8 of the fourth lens L4 are aspherical surfaces.

The fifth lens L5 is a biconvex lens with positive refractive power, that is, both the object side S9 and the image side S10 of the fifth lens L5 are convex, and at least one of the object side S9 and the image side S10 of the fifth lens L5 is convex. is an aspherical surface. In the second embodiment, one side of the fifth lens L5 toward the object side is curved and protrudes into the object side S9, and the optical axis Z passes through the object side S9 and the image side S10, and The object side S9 and the image side S10 of the fifth lens L5 are both aspherical surfaces.

In addition, the optical imaging lens 200 further includes an infrared filter L6. The infrared filter L6 is located on one side of the image side S10 of the fifth lens L5 and is used to filter out excess infrared rays in the image light passing through the first lens group G1 to the second lens group G2.

In order for the optical imaging lens 200 of the present invention to maintain good optical performance and high imaging quality, the optical imaging lens 200 also meets the following conditions: (1) -5＜fg1/F＜-3.5; (2) -2＜f1/F＜-1, 3.5＜f2/F＜5.5; (3) 1.5＜fg2/F＜2.5; (4) 1＜f3/F＜1.8, -1.5＜f4/F＜-0.5, 1＜f5/F＜2; (5) -3＜fg1/fg2＜-1.5.

Wherein, F is the focal length of the optical imaging lens 200, f1 is the focal length of the first lens L1; f2 is the focal length of the second lens L2; f3 is the focal length of the third lens L3; f4 is the focal length of the fourth lens L4. Focal length; f5 is the focal length of the fifth lens L5; fg1 is the combined focal length of the first lens group G1; fg2 is the combined focal length of the second lens group G2.

The following Table 4 is the data of the optical imaging lens 200 of the second embodiment of the present invention, including: the focal length F (or effective focal length), the aperture value Fno, the field of view FOV, and the curvature radius R of each lens of the optical imaging lens 200 , the distance between each surface and the next surface on the optical axis Z, the refractive index Nd of each lens, dispersion, and the focal length of each lens; among them, the unit of focal length, radius of curvature, and distance is mm. The data listed below are not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make appropriate changes to the parameters or settings after referring to the present invention, but they should still fall within the scope of the present invention. . Table 4 Focal length F= 2.505mm; Aperture value Fno=2.0; Field of view FOV= 100 degrees Surface number Radius of curvature R distance Refractive indexNd dispersion focal length Remarks S1 2.95 1.22 1.53 56.28 -3.960 First lens L1 S2 1.05 3.30 S3 34.77 1.97 1.64 23.97 12.212 Second lens L2 S4 -9.86 1.61 ST Infinity 0.45 Aperture ST S5 4.20 2.28 1.53 56.28 3.287 Third lens L3 S6 -2.40 0.15 S7 -4.92 1.00 1.64 23.97 -2.402 Fourth lens L4 S8 2.42 0.32 S9 2.93 3.40 1.53 56.28 3.64 Fifth lens L5 S10 -3.34 2.33 S11 Infinity 0.3 1.52 64.17 Infrared filter L6 Im Infinity 0.23 Imaging surface Im

From the above Table 4, it can be seen that the focal length of the optical imaging lens 200 of the second embodiment is F=2.505mm, the aperture value Fno=2.0, the field of view FOV=100 degrees, and the focal length of the first lens L1 is f1=-3.960mm. , the focal length of the second lens L2 is f2=12.212mm, the focal length of the third lens L3 is f3=3.287mm, the focal length of the fourth lens L4 is f4=-2.402mm, the focal length of the fifth lens L5 is f5=3.64mm, The combined focal length of the first lens group G1 is fg1 = -10.598mm, and the combined focal length of the second lens group G2 is fg2 = 5.116mm.

In addition, based on the above detailed parameters, the detailed numerical values of the aforementioned conditional expression in the second embodiment are as follows: (1) fg1/F=-4.23; (2) f1/F=-1.58, f2/F=4.88; (3) fg2/F=2.04; (4) f3/F=1.31, f4/F=-0.96, f5/F=1.45; (5) fg1/fg2=-2.07.

From the data in Table 4 above, it can be concluded that the first lens group G1 and the second lens group G2 satisfy the aforementioned conditions (1) to (5) set for the optical imaging lens 200 .

In addition, in the optical imaging lens 100 of the second embodiment, the aspherical surfaces of the object side S1, S3, S5, S7, S9 and the image side S2, S4, S6, S8, S10 of the first lens L1 to the fifth lens L5 The surface profile shape Z is obtained by the following formula: Among them, Z: the contour shape of the aspheric surface; c: the reciprocal of the radius of curvature; h: the off-axis half height of the surface; k: cone coefficient; A4, A6, A8, A10, A12, A14 and A16: the off-axis half height of the surface Coefficients of various orders of high h.

The cone coefficients of the object side surfaces S1, S3, S5, S7, S9 and the image side surfaces S2, S4, S6, S8, S10 of the first lens L1 to the fifth lens L5 in the optical imaging lens 100 of the second embodiment of the present invention k and the coefficients of each order of A4, A6, A8, A10, A12, A14 and A16, as shown in Table 5 and 6 below: Table 5 Surface number S1 S2 S3 S4 S5 k -1.0434E+00 -9.6860E-01 6.3714E+01 -6.8107E-01 -3.5563E+00 A4 -1.1776E-02 -7.7736E-03 -3.7826E-03 -5.0932E-03 5.0408E-03 A6 6.1239E-04 1.1883E-03 -1.1414E-03 -7.6155E-04 2.4876E-05 A8 -2.0953E-05 -5.7703E-04 1.0590E-04 6.4089E-05 -1.0729E-03 A10 4.4041E-07 8.5018E-05 -6.3261E-05 1.0870E-05 5.9231E-04 A12 -4.0258E-09 -6.6305E-06 7.1856E-06 -1.1859E-06 -1.7651E-04 A14 0 0 0 0 0 A16 0 0 0 0 0 Table 6 Surface number S6 S7 S8 S9 S10 k -8.0512E+00 -5.2887E+00 -1.1344E+01 -1.2063E+01 -1.6441E-01 A4 -2.3600E-02 -1.0221E-02 -6.3097E-04 -1.2613E-03 1.2249E-03 A6 -6.4612E-05 -1.2451E-02 -8.8822E-04 8.4810E-04 5.6380E-04 A8 -3.9526E-04 3.8414E-03 4.1276E-04 -7.3089E-05 -4.1593E-05 A10 1.2447E-04 -8.7349E-04 -6.4061E-05 2.6903E-06 4.7313E-06 A12 -3.1514E-05 9.4800E-05 3.7356E-06 -1.4235E-17 -2.3963E-17 A14 0 0 0 0 0 A16 0 0 0 0 0

Next, optical simulation data is used to verify the imaging quality of the optical imaging lens 200 . FIG. 2B is a graph of longitudinal spherical aberration, astigmatism and optical distortion according to the second embodiment of the present invention. The results in FIG. 2B can verify that the optical imaging lens 200 of this embodiment can effectively improve imaging quality through the above design.

Please refer to FIG. 3A , which is an optical imaging lens 300 according to a third embodiment of the present invention. It includes a first lens group G1 , an aperture ST and a second lens group G1 along an optical axis Z from an object side to an image side. Mirror group G2. In the third embodiment, the first lens group G1 includes a first lens L1 and a second lens L2 arranged along the optical axis Z from the object side to the image side; the second lens group G2 includes A third lens L3, a fourth lens L4 and a fifth lens L5 are arranged along the optical axis Z from the object side to the image side.

The first lens L1 is a convex-concave lens with negative refractive power, wherein the object side S1 of the first lens L1 is a convex surface protruding toward the object side arc, and the image side S2 of the first lens L1 is a concave surface, and At least one of the object side S1 and the image side S2 of the first lens L1 is an aspheric surface; in the third embodiment, a portion of the first lens L1 toward the image side is arc-shaped and concave to the image side S2, The optical axis Z passes through the object side S1 and the image side S2, and both the object side S1 and the image side S2 of the first lens L1 are aspherical surfaces.

The second lens L2 is a biconvex lens with positive refractive power, that is, both the object side S3 and the image side S4 of the second lens L2 are convex, and at least one of the object side S3 and the image side S4 of the second lens L2 is convex. is an aspherical surface. In the third embodiment, one side of the second lens L2 toward the image side is curved and protrudes into the object side S3, and the optical axis Z passes through the object side S3 and the image side S4, and The object side S3 and the image side S4 of the second lens L2 are both aspherical surfaces.

The third lens L3 is a biconvex lens with positive refractive power, that is, the object side S5 and the image side S6 of the third lens L3 are both convex, and at least one of the object side S5 and the image side S6 of the third lens L3 is convex. is an aspherical surface. In the third embodiment, one side of the third lens L3 toward the object side protrudes in an arc shape to form the object side S5, and the optical axis Z passes through the object side S5 and the image side S6, and The object side S5 and the image side S6 of the third lens L3 are both aspherical surfaces.

The fourth lens L4 is a biconcave lens with negative refractive power, that is, both the object side S7 and the image side S8 of the fourth lens L4 are concave, and at least one of the object side S7 and the image side S8 of the fourth lens L4 is concave. is an aspherical surface. In the third embodiment, one surface of the fourth lens L4 toward the object side is partially concave in an arc to form the object side S7, and the optical axis Z passes through the object side S7 and the image side S8, and Both the object side S7 and the image side S8 of the fourth lens L4 are aspherical surfaces.

The fifth lens L5 is a biconvex lens with positive refractive power, that is, both the object side S9 and the image side S10 of the fifth lens L5 are convex, and at least one of the object side S9 and the image side S10 of the fifth lens L5 is convex. is an aspherical surface. In the third embodiment, one side of the fifth lens L5 toward the object side protrudes in an arc shape to form the object side S9, and the optical axis Z passes through the object side S9 and the image side S10, and The object side S9 and the image side S10 of the fifth lens L5 are both aspherical surfaces.

In addition, the optical imaging lens 300 further includes an infrared filter L6. The infrared filter L6 is located on one side of the image side S10 of the fifth lens L5 and is used to filter out excess infrared rays in the image light passing through the first lens group G1 to the second lens group G2.

In order for the optical imaging lens 300 of the present invention to maintain good optical performance and high imaging quality, the optical imaging lens 300 also meets the following conditions: (1) -5＜fg1/F＜-3.5; (2) -2＜f1/F＜-1, 3.5＜f2/F＜5.5; (3) 1.5＜fg2/F＜2.5; (4) 1＜f3/F＜1.8, -1.5＜f4/F＜-0.5, 1＜f5/F＜2; (5) -3＜fg1/fg2＜-1.5.

Wherein, F is the focal length of the optical imaging lens 300, f1 is the focal length of the first lens L1; f2 is the focal length of the second lens L2; f3 is the focal length of the third lens L3; f4 is the focal length of the fourth lens L4. Focal length; f5 is the focal length of the fifth lens L5; fg1 is the combined focal length of the first lens group G1; fg2 is the combined focal length of the second lens group G2.

Table 7 below is the data of the optical imaging lens 300 of the third embodiment of the present invention, including: the focal length F (or effective focal length), the aperture value Fno, the field of view FOV, and the curvature radius R of each lens of the optical imaging lens 300 , the distance between each surface and the next surface on the optical axis Z, the refractive index Nd of each lens, dispersion, and the focal length of each lens; among them, the unit of focal length, radius of curvature, and distance is mm. The data listed below are not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make appropriate changes to the parameters or settings after referring to the present invention, but they should still fall within the scope of the present invention. . Table 7 Focal length F= 2.949mm; Aperture value Fno=2.15; Field of view FOV= 88 degrees Surface number Radius of curvature R distance Refractive indexNd dispersion focal length Remarks S1 3.31 1.35 1.53 56.28 -4.407 First lens L1 S2 1.17 3.25 S3 33.39 2.00 1.64 23.97 12.054 Second lens L2 S4 -9.80 1.58 ST Infinity 0.43 Aperture ST S5 4.68 2.17 1.53 56.28 3.604 Third lens L3 S6 -2.68 0.15 S7 -5.69 1.00 1.64 23.97 -2.611 Fourth lens L4 S8 2.53 0.36 S9 3.04 3.29 1.53 56.28 3.910 Fifth lens L5 S10 -4.00 2.94 S11 Infinity 0.3 1.52 64.17 Infrared filter L6 Im Infinity 0.23 Imaging surface Im

From the above Table 7, it can be seen that the focal length of the optical imaging lens 300 of the third embodiment is F=2.949mm, the aperture value Fno=2.15, the field of view FOV=88 degrees, and the focal length of the first lens L1 is f1=-4.407mm. , the focal length of the second lens L2 is f2=12.054mm, the focal length of the third lens L3 is f3=3.604mm, the focal length of the fourth lens L4 is f4=-2.611mm, the focal length of the fifth lens L5 is f5=3.910mm, The combined focal length of the first lens group G1 is fg1 = -13.106mm, and the combined focal length of the second lens group G2 is fg2 = 5.434mm.

In addition, based on the above detailed parameters, the detailed numerical values of the aforementioned conditional expression in the third embodiment are as follows: (1) fg1/F=-4.44; (2) f1/F=-1.49, f2/F=4.09; (3) fg2/F=1.84; (4) f3/F=1.22, f4/F=-0.89, f5/F=1.33; (5) fg1/fg2=-2.41.

From the data in Table 7 above, it can be concluded that the first lens group G1 and the second lens group G2 satisfy the aforementioned conditions (1) to (5) set for the optical imaging lens 300 .

In addition, in the optical imaging lens 300 of the third embodiment, the aspherical surfaces of the object side S1, S3, S5, S7, S9 and the image side S2, S4, S6, S8, S10 of the first lens L1 to the fifth lens L5 The surface profile shape Z is obtained by the following formula: Among them, Z: the contour shape of the aspheric surface; c: the reciprocal of the radius of curvature; h: the off-axis half height of the surface; k: cone coefficient; A4, A6, A8, A10, A12, A14 and A16: the off-axis half height of the surface Coefficients of various orders of high h.

The cone coefficient k of the object side S1, S3, S5, S7, S9 and the image side S2, S4, S6, S8, S10 of the first lens L1 to the fifth lens L5 in the optical imaging lens 300 of the third embodiment And the coefficients of A4, A6, A8, A10, A12, A14 and A16, as shown in Table 8 and 9 below: Table 8 Surface number S1 S2 S3 S4 S5 k -8.5917E-01 -9.7309E-01 -9.0000E+01 4.4110E+00 -4.9412E+00 A4 -1.0007E-02 -9.7991E-03 -6.6392E-03 -6.8411E-03 4.5995E-03 A6 5.5402E-04 1.7424E-03 -1.0708E-03 1.1870E-05 5.1742E-04 A8 -2.1232E-05 -4.3864E-04 1.8765E-04 -4.0772E-05 -1.4844E-03 A10 4.7016E-07 7.9478E-05 -6.8585E-05 1.7126E-05 7.5818E-04 A12 -4.0694E-09 -6.6305E-06 7.1856E-06 -1.1859E-06 -1.7651E-04 A14 0 0 0 0 0 A16 0 0 0 0 0 Table 9 Surface number S6 S7 S8 S9 S10 k -1.0132E+01 -9.0747E+00 -1.0890E+01 -1.1156E+01 1.7390E-01 A4 -2.3534E-02 -8.7318E-03 9.1350E-04 -1.0438E-03 2.0464E-04 A6 -1.5962E-05 -1.2252E-02 -6.8479E-04 7.7448E-04 3.7024E-04 A8 -3.8409E-04 4.0220E-03 2.9838E-04 -7.5335E-05 -2.9976E-05 A10 1.4488E-04 -9.4802E-04 -5.6064E-05 2.9930E-06 3.6866E-06 A12 -3.1514E-05 9.4800E-05 3.7356E-06 -2.4778E-17 -2.5585E-17 A14 0 0 0 0 0 A16 0 0 0 0 0

Next, optical simulation data is used to verify the imaging quality of the optical imaging lens 300 . FIG. 3B is a graph of longitudinal spherical aberration, astigmatism and optical distortion according to the third embodiment of the present invention. The results of FIG. 3B can verify that the optical imaging lens 300 of this embodiment can effectively improve imaging quality through the above design.

The above are only the best possible embodiments of the present invention. It should be noted that the data listed in the above table are not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can, after referring to the present invention, Appropriate changes to the parameters or settings should be made within the scope of the present invention. All equivalent changes made by applying the specification and patent application scope of this invention should be included in the patent scope of this invention.

[Invention] 100,200,300: Optical imaging lens G1: First lens group G2: Second mirror group L1: first lens L2: Second lens L3: Third lens L4: fourth lens L5: fifth lens L6: Infrared filter Im: imaging surface ST: aperture Z: optical axis S1, S3, S5, S7, S9: side of object S2, S4, S6, S8, S10: side view

FIG. 1A is a schematic structural diagram of an optical imaging lens according to the first embodiment of the present invention. 1B is a graph showing longitudinal spherical aberration, astigmatism and optical distortion of the optical imaging lens according to the first embodiment of the present invention in order from left to right. FIG. 2A is a schematic structural diagram of an optical imaging lens according to a second embodiment of the present invention. 2B is a graph illustrating longitudinal spherical aberration, astigmatism and optical distortion of the optical imaging lens according to the second embodiment of the present invention in order from left to right. FIG. 3A is a schematic structural diagram of an optical imaging lens according to a third embodiment of the present invention. 3B is a graph illustrating longitudinal spherical aberration, astigmatism and optical distortion of the optical imaging lens according to the third embodiment of the present invention in order from left to right.

100: Optical imaging lens

G1: First lens group

G2: Second mirror group

L1: first lens

L2: Second lens

L3: Third lens

L4: fourth lens

L5: fifth lens

L6: Infrared filter

Im: imaging surface

ST: aperture

Z: optical axis

S1, S3, S5, S7, S9: side of object

S2, S4, S6, S8, S10: side view

Claims (25)

An optical imaging lens includes in sequence along an optical axis from an object side to an image side: A first lens group includes a first lens and a second lens arranged along the optical axis from the object side to the image side; wherein The first lens has negative refractive power, the object side of the first lens is a convex surface, the image side of the first lens is a concave surface, and at least one of the object side and the image side of the first lens is aspherical; The second lens is a biconvex lens with positive refractive power, and at least one of the object side and image side of the second lens is aspherical; an aperture; and A second lens group includes a third lens, a fourth lens and a fifth lens arranged along the optical axis from the object side to the image side; wherein The third lens is a biconvex lens with positive refractive power, and at least one of the object side and image side of the third lens is aspherical; The fourth lens is a biconcave lens with negative refractive power, and at least one of the object side and image side of the fourth lens is aspherical; The fifth lens is a biconvex lens with positive refractive power, and at least one of the object side and image side of the fifth lens is aspherical; Among them, the optical imaging lens meets the following conditions: -5<fg1/F<-3.5, where F is the focal length of the optical imaging lens, and fg1 is the combined focal length of the first lens group. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditions: -2<f1/F<-1, where F is the focal length of the optical imaging lens and f1 is the focal length of the first lens. The optical imaging lens as described in claim 1, wherein the optical imaging lens meets the following conditions: 3.5<f2/F<5.5, where F is the focal length of the optical imaging lens and f2 is the focal length of the second lens. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the following conditions: 1<f3/F<1.8, where F is the focal length of the optical imaging lens and f3 is the focal length of the third lens. The optical imaging lens as described in claim 1, wherein the optical imaging lens satisfies the following conditions: -1.5<f4/F<-0.5, where F is the focal length of the optical imaging lens and f4 is the focal length of the fourth lens. The optical imaging lens as described in claim 1, wherein the optical imaging lens satisfies the following conditions: 1<f5/F<2, where F is the focal length of the optical imaging lens and f5 is the focal length of the fifth lens. The optical imaging lens as described in claim 1, wherein the optical imaging lens meets the following conditions: 1.5<fg2/F<2.5, where F is the focal length of the optical imaging lens and fg2 is the combined focal length of the second lens group. The optical imaging lens as described in claim 1, wherein the optical imaging lens satisfies the following conditions: -3<fg1/fg2<-1.5, where fg1 is the combined focal length of the first lens group, and fg2 is the combined focal length of the second lens group. Combined focal length. The optical imaging lens according to claim 1, wherein both the object side and the image side of the first lens are aspherical. The optical imaging lens according to claim 1, wherein both the object side and the image side of the second lens are aspherical. The optical imaging lens according to claim 1, wherein both the object side and the image side of the third lens are aspherical. The optical imaging lens according to claim 1, wherein both the object side and the image side of the fourth lens are aspherical. The optical imaging lens according to claim 1, wherein both the object side and the image side of the fifth lens are aspherical. An optical imaging lens includes in sequence along an optical axis from an object side to an image side: A first lens group includes a first lens and a second lens arranged along the optical axis from the object side to the image side; wherein The first lens has negative refractive power, the object side of the first lens is a convex surface, the image side of the first lens is a concave surface, and at least one of the object side and the image side of the first lens is aspherical; The second lens is a biconvex lens with positive refractive power, and at least one of the object side and image side of the second lens is aspherical; an aperture; and A second lens group includes a third lens, a fourth lens and a fifth lens arranged along the optical axis from the object side to the image side; wherein The third lens is a biconvex lens with positive refractive power, and at least one of the object side and image side of the third lens is aspherical; The fourth lens is a biconcave lens with negative refractive power, and at least one of the object side and image side of the fourth lens is aspherical; The fifth lens is a biconvex lens with positive refractive power, and at least one of the object side and image side of the fifth lens is aspherical; Wherein, the optical imaging lens meets the following conditions: 1.5<fg2/F<2.5, where F is the focal length of the optical imaging lens, and fg2 is the combined focal length of the second lens group. The optical imaging lens according to claim 14, wherein the optical imaging lens satisfies the following conditions: -2<f1/F<-1, where F is the focal length of the optical imaging lens and f1 is the focal length of the first lens. The optical imaging lens according to claim 14, wherein the optical imaging lens satisfies the following conditions: 3.5<f2/F<5.5, where F is the focal length of the optical imaging lens and f2 is the focal length of the second lens. The optical imaging lens of claim 14, wherein the optical imaging lens satisfies the following conditions: 1<f3/F<1.8, where F is the focal length of the optical imaging lens and f3 is the focal length of the third lens. The optical imaging lens as described in claim 14, wherein the optical imaging lens satisfies the following conditions: -1.5<f4/F<-0.5, where F is the focal length of the optical imaging lens and f4 is the focal length of the fourth lens. The optical imaging lens according to claim 14, wherein the optical imaging lens satisfies the following conditions: 1<f5/F<2, where F is the focal length of the optical imaging lens and f5 is the focal length of the fifth lens. The optical imaging lens as described in claim 14, wherein the optical imaging lens satisfies the following conditions: -3<fg1/fg2<-1.5, where fg1 is the combined focal length of the first lens group, and fg2 is the combined focal length of the second lens group. Combined focal length. The optical imaging lens according to claim 14, wherein both the object side and the image side of the first lens are aspherical. The optical imaging lens according to claim 14, wherein both the object side and the image side of the second lens are aspherical. The optical imaging lens of claim 14, wherein both the object side and the image side of the third lens are aspherical. The optical imaging lens according to claim 14, wherein both the object side and the image side of the fourth lens are aspherical. The optical imaging lens of claim 14, wherein both the object side and the image side of the fifth lens are aspherical.